Place cooled brown butter and cream cheese into a large mixing bowl. Stir until well combined and creamy. Stir in brown sugar mixing until well combined. Add egg and vanilla mixing well. Slowly add flour, malted milk, cocoa powder, baking soda, and salt. Stir until just combined then add chocolate and Oreo cookies. With a medium cookie scoop, scoop dough onto prepared baking sheet placing 1 inch apart. Bake for 12-14 minutes, until baked through. Remove and let cool before transferring. Serve room temperature.